To switch the TV set into service mode please see instruction below.1 - Select pr. number 912 - Adjust sharpness to minimum and exit all menu.3 - Quickly press the key sequence : RED - GREEN - menuTo exit SERVICE menu press menu key or Std By key.In Service Mode press "OK" to the microcontroller i.e. the I2C bus is free and the set can be controlled by externalequipment.Press "OK" again to allow the microcontroller to control the set again